by Jeff Zillgitt and Adi Joseph, USA TODAY Sports

by Jeff Zillgitt and Adi Joseph, USA TODAY Sports

Oklahoma City Thunder star Kevin Durant will not play for Team USA in the FIBA World Cup later this summer in Spain, citing mental and physical exhaustion.

"This was an extremely difficult decision as I take great pride in representing our country," Durant said in a statement. "I know that I owe it to my USA Basketball teammates to be totally invested in the experience. After going through training camp with USAB, I realized I could not fulfill my responsibilities to the team from both a time and energy standpoint."I need to take a step back and take some time away, both mentally and physically in order to prepare for the upcoming NBA season. I will be rooting for USAB and look forward to future opportunities with them."

In a statement, USA Basketball said Durant called chairman Jerry Colangelo and coach Mike Krzyzewski to deliver the news.

"Kevin â?¦ expressed that he is just physically and mentally drained from the NBA season and his attention to his many responsibilities," Colangelo said. "He tried to give it a go at our recent Las Vegas training camp but felt coming out of camp that he was not prepared to fulfill the commitment he made to the team.

"Coach K and I fully support Kevin. His well-being is the most important thing to us and we support him taking the time to get ready for next season. He's been part of the National Team program for eight years and a big part of the success we have achieved, and we look forward to him being part of our success in the future as well."

Durant was on Team USA's 2010 world championship and 2012 London Olympics gold medal teams. He announced last summer that he planned to anchor the roster this year, too.

His departure could have a major affect on a severely depleted frontcourt. Small forward Paul George was injured in an exhibition last week, while power forwards LaMarcus Aldridge and Kevin Love pulled out previously.

USA Basketball is adamant Durant's decision has nothing to do with George's devastating injury sustained last week in an exhibition game. Thunder teammate Russell Westbrook also pulled out of the event, citing his knee injuries last season.

Durant likely would have split his time between the two positions, starting at small forward. Now Team USA's best options there are first-timers Gordon Hayward, Chandler Parsons and Kyle Korver, none of whom have made NBA All-Star teams. Anthony Davis, a 21-year-old, is the only All-Star frontcourt player left for Team USA, unless Love decides to play now that his trade to the Cleveland Cavaliers is agreed upon.

The USA has not lost in a major tournament since Krzyzewski took over as head coach, winning the 2008 Beijing Games before the 2010 world championships in Turkey and the 2012 Olympics. That could be tested now.

If the USA does not win the World Cup, it will have to qualify for the 2016 Rio Olympics next summer in a FIBA Americas event.